US Bridges

NH125 over Lyman Brook

Fair

Strafford County, New Hampshire · 1.0 MI Rochester Tl · Structure no. 017302290012500

Built
1935
90 years old, rebuilt 1973
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
5,629
2023 count
Owner
State
State Highway Agency

About this bridge

NH125 over Lyman Brook is a concrete slab carrying NH125 over Lyman Brook in Strafford County, New Hampshire. It was built in 1935 and reconstructed in 1973, so it is 90 years old, older than the New Hampshire average of 56.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,629 vehicles a day, roughly 7% of them trucks, projected to reach 8,330 by 2043. The structure is 28 ft (8.5 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesNH125
CrossesLyman Brook
Location1.0 MI Rochester Tl
RouteState Highway 16
CountyStrafford County
StateNew Hampshire
Coordinates43.39074, -70.99072
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.4 US tons
Inventory rating64.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length28 ft (8.5 m)
Longest span23 ft (7 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,629 (2023)
Projected traffic8,330 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NH125 over Lyman Brook built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1973.

What condition is NH125 over Lyman Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does NH125 over Lyman Brook carry?

About 5,629 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is NH125 over Lyman Brook?

The structure is 28 ft (8.5 m) long with a longest span of 23 ft (7 m) and a deck 36 ft wide.

Who owns NH125 over Lyman Brook?

It is owned by the State Highway Agency.